Oscar 9
From Halopedia, the Halo wiki
From Halopedia, the Halo wiki
Oscar 9 was a UNSC D77-TC Pelican dropship. It was constructed in 2552, at the same time as Oscar 5, Oscar 6, and Oscar 8[1].
Though Oscar 9 is not mentioned by name in the film, O9 is clearly visible on the Pelican's cockpit, which conforms to the identification scheme of UNSC Pelicans.